拘束型磁性制振材の制振特性　第２報　　損失係数の計算および実験検証

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  • The Damping Property of Magnetic Rubber Dampers with a Constraining Layer. 2nd Report. Estimation of the Loss Factor of Magnetic Rubber Dampers with a Constraining Layer and Experimental Demonstration.
  • コウソクガタ ジセイ セイシンザイ ノ セイシン トクセイ ダイ2ホウ ソンシツ ケイスウ ノ ケイサン オヨビ ジッケン ケンショウ

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The authors have been developing magnetic rubber dampers with a constraining layer (MRDC). They are generally installed on vibrating steel plates with the magnetic attractive force of the magnetic rubber layer. The damping performance of these MRDC depends mainly on the frictional loss due to the relative slip motion arising between the magnetic rubber layer and the vibrating steel plate. In the previous paper, the flexural vibration of a beam with a sheet of MRDC was theoretically analyzed by taking the frictional loss due to the relative slip motion into account and the equation to calculate the loss factor of the beam with a sheet of MRDC was derived. In this paper, the modal loss factors of the beam with a sheet of MRDC were calculated based on the derived equation, and those calculated values were compared with the data obtained experimentally using the method of resonance. Also, the relationship between the loss factor of the beam with a sheet of MRDC and material properties-magnetic attractive force, the content of ferrite powder, the thicknesses of constraining-, magnetic rubber-, and base-layers has been discussed.

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